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From:   Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Date:   Thu, 2 Jan 2020 04:19:10 +0500
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Subject: Re: [bugreport] Ext4 automatically checked at each boot
To:     "Theodore Y. Ts'o" <tytso@mit.edu>
Cc:     linux-ext4@vger.kernel.org
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On Wed, 1 Jan 2020 at 19:17, Theodore Y. Ts'o <tytso@mit.edu> wrote:
>
> The problem is casued by the fact that the mount time is incorrect,
> which indicates that the system time was incorrect at the time when
> the file system was mounted and when it fsck was run.  Since the last
> write time was in the future, this triggered "time is insane" check.
>
> This is inconsistent with your report that started happening when you
> switched to a new motherboard.  That's because the real time clock is
> not reporting the correct time when the system is booted.  Later on,
> in the boot cycle, after the root file system is checked and remounted
> read-write, the system time is getting set from an internet time
> server.  This then causes the last write time to be ahead of the last
> mount time, and "in the future" with respect to the real time clock.
>
> Normally, the hardware clock's time gets set to match system time when
> it is set from network time, or when the system is getting shut down
> cleanly, but your init scripts aren't doing this properly --- or you
> normally shut down your system by just flipping the power switch, and
> not letting the shutdown sequence run correctly.  The other possibilty
> is the real time clock on your system is just completly busted
> (although normally when that happens, the last mount time would be in
> the 1970's.)
>
> Running "/sbin/hwclock -w" as root may fix things; as is figuring out
> why this isn't run automatically by your boot scripts.  Another
> workaround is to add to /etc/e2fsck.conf the following:
>
> [options]
>         broken_system_lock = true
>
> This will disable e2fsck's time checks.
>

Thank you very much for the tip, I would never have guessed that the
cause of this issue in hwclock.
I started to watch hwclock through the motherboard BIOS and found that
hwclock resets every time after booting Linux.
Demonstration: https://youtu.be/TBrLNFbBaPo
Apparently for this reason, "hwclock -w" did not help me, workaround
with "broken_system_clock = true" is working, but I would like to fix
the root of the cause.
Who can help with this?


--
Best Regards,
Mike Gavrilov.